• Create a local variable of the class you want to call.
  • e.g. A a = new A();
  • where Ais an external class and a is a local variable that serves as copy of class A. Here a is also know as an object of class A, as it is derived from class A.
• Once an object of a class is created, you can access all public member of that external class.
  • e.g. a.method1();
  • here we use a dot operator after the object "a". as shown in the picture below.

//import java io.*;
//javac simple.java
public class Test_this
{
public static void main(String args[])//this is an netry function must have
{
//nameoftheclass varablea = new Nameofthecxlass();
//
A a=new A();
a.method1();
a.method2();
int n1;
}
}//main
class A
{
void method1()
{
System.out.println("hello, my name is baba");
}
int method2()
{
System.out.println("hello world");
return 0;
}
}